Auto merge of #31889 - alexcrichton:update-jemalloc-again, r=nikomatsakis

Now that jemalloc/jemalloc@767d850 is upstream, the relevant deadlocking issue which prompted our downgrade has been resolved. As a result, there's no known issue to *not* upgrade! This also re-enables jemalloc for the pc-windows-gnu target as known issues with that have also been fixed.

Closes #31030

Author: bors

mk/cfg/i686-pc-windows-gnu.mk

@@ -25,5 +25,3 @@ CFG_GNU_TRIPLE_i686-pc-windows-gnu := i686-w64-mingw32
 CFG_THIRD_PARTY_OBJECTS_i686-pc-windows-gnu := crt2.o dllcrt2.o
 CFG_INSTALLED_OBJECTS_i686-pc-windows-gnu := crt2.o dllcrt2.o rsbegin.o rsend.o
 CFG_RUSTRT_HAS_STARTUP_OBJS_i686-pc-windows-gnu := 1
-# FIXME(#31030) - there's not a great reason to disable jemalloc here
-CFG_DISABLE_JEMALLOC_i686-pc-windows-gnu := 1

mk/cfg/x86_64-pc-windows-gnu.mk

@@ -25,5 +25,3 @@ CFG_GNU_TRIPLE_x86_64-pc-windows-gnu := x86_64-w64-mingw32
 CFG_THIRD_PARTY_OBJECTS_x86_64-pc-windows-gnu := crt2.o dllcrt2.o
 CFG_INSTALLED_OBJECTS_x86_64-pc-windows-gnu := crt2.o dllcrt2.o rsbegin.o rsend.o
 CFG_RUSTRT_HAS_STARTUP_OBJS_x86_64-pc-windows-gnu := 1
-# FIXME(#31030) - there's not a great reason to disable jemalloc here
-CFG_DISABLE_JEMALLOC_x86_64-pc-windows-gnu := 1

src/jemalloc

@@ -8,11 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-windows everything is the system allocator on windows
-// ignore-musl no dylibs on musl yet
-// ignore-bitrig no jemalloc on bitrig
-// ignore-openbsd no jemalloc on openbsd
 // aux-build:allocator-dylib.rs
+// aux-build:allocator1.rs
 // no-prefer-dynamic
 // error-pattern: cannot link together two allocators
 
@@ -23,7 +20,18 @@
 #![feature(alloc_jemalloc)]
 
 extern crate allocator_dylib;
+
+// The main purpose of this test is to ensure that `alloc_jemalloc` **fails**
+// here (specifically the jemalloc allocator), but currently jemalloc is
+// disabled on quite a few platforms (bsds, emscripten, msvc, etc). To ensure
+// that this just passes on those platforms we link in some other allocator to
+// ensure we get the same error.
+//
+// So long as we CI linux/OSX we should be good.
+#[cfg(any(target_os = "linux", target_os = "macos"))]
 extern crate alloc_jemalloc;
+#[cfg(not(any(target_os = "linux", target_os = "macos")))]
+extern crate allocator1;
 
 fn main() {
     allocator_dylib::foo();

src/test/compile-fail/allocator-dylib-is-system.rs

@@ -8,11 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-windows everything is the system allocator on windows
-// ignore-musl no dylibs on musl right now
-// ignore-bitrig no jemalloc on bitrig
-// ignore-openbsd no jemalloc on openbsd
 // aux-build:allocator-dylib2.rs
+// aux-build:allocator1.rs
 // error-pattern: cannot link together two allocators
 
 // Ensure that rust dynamic libraries use jemalloc as their allocator, verifying
@@ -21,9 +18,19 @@
 #![feature(alloc_system)]
 
 extern crate allocator_dylib2;
+
+// The main purpose of this test is to ensure that `alloc_system` **fails**
+// here (specifically the system allocator), but currently system is
+// disabled on quite a few platforms (bsds, emscripten, msvc, etc). To ensure
+// that this just passes on those platforms we link in some other allocator to
+// ensure we get the same error.
+//
+// So long as we CI linux/OSX we should be good.
+#[cfg(any(target_os = "linux", target_os = "macos"))]
 extern crate alloc_system;
+#[cfg(not(any(target_os = "linux", target_os = "macos")))]
+extern crate allocator1;
 
 fn main() {
     allocator_dylib2::foo();
 }
-

src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs

@@ -10,9 +10,9 @@
 
 #![feature(alloc_jemalloc, alloc_system)]
 
-#[cfg(not(any(windows, target_os = "bitrig", target_os = "openbsd", target_os="emscripten")))]
+#[cfg(any(target_os = "linux", target_os = "macos"))]
 extern crate alloc_jemalloc;
-#[cfg(any(windows, target_os = "bitrig", target_os = "openbsd", target_os="emscripten"))]
+#[cfg(not(any(target_os = "linux", target_os = "macos")))]
 extern crate alloc_system;
 
 fn main() {